Derivatives of 4-hydroxy coumarin and the preparation thereof

ABSTRACT

THE 4-HYDROXY COUMARINS ARE REPRESENTED BY THE FORMULA   2-(O=),3-(R1-CH(-OH)-CH2-CH(-R)-),4-(HO-),R2-2H-CHROMENE   IN WHICH R IS A MEMBER OF THE GROUP FORMED BY HYDROGEN, THE PHENYL, HALOPHENYL, HIHALOPHENYL, NITROPHENYL, METHOXPENYL, TOLYL, METHYLENE DIOXPHENYL AND FURYL RADICALS; R1 IS A MEMBER OF THE GROUP FORMED BY THE METHYL, PHENYL, HALOPHENYL, NITROPHENYL, DIPHENYL, HALODIPHENYL, NITRODIPHENYL AND NAPHTHYL RADICALS; AND R2 IS HYDROGEN OR A HALOGEN. THESE ARE 4-HYDROXY COUMARINS HAVE VERY POWERFUL ORAL ANTICOAGULATING ACTIONS OF THE ANTIVITAMIN K TYPE.

United States Patent Olfice 3,651,091 Patented Mar. 21, 1972 3,651,091 DERIVATIVES OF 4-HYDROXY COUMARIN AND THE PREPARATION THEREOF Eugene Boschetti, Venissieux, Darius Molho, Boulognesur-Seine, and Louis Fontaine, Lyon, France, assignors to Lipha, Lyonnaise Industrielle Pharmaceutique No Drawing. Continuation-impart of application Ser. No. 689,347, Dec. 11, 1967, now Patent No. 3,574,234. This application Nov. 21, 1969, Ser. No. 878,876 Claims priority, application France, Dec. 13, 1966, 87,213; Nov. 13, 1967, 127,915; Nov. 28, 1968,

Int. Cl. C0711 7/30 US. Cl. 260-343.2 R 13 Claims ABSTRACT OF THE DISCLOSURE The 4-hydroxy coumarins are represented by the formula on v I EH-CH -ZH-R R H in which R is a member of the group formed by hydrogen, the phenyl, halophenyl, dihalophenyl, nitrophenyl, me thoxypenyl, tolyl, methylene dioxyphenyl and furyl radicals;

R is a member of the group formed by the methyl, phenyl, halophenyl, nitrophenyl, diphenyl, halodiphenyl, nitrodiphenyl and naphthyl radicals; and

R is hydrogen or a halogen.

These new 4-hydroxy coumarins have very powerful oral anticoagulating actions of the antivitamin K type.

This application is a continuation-in-part of application Ser. No. 689,347, filed Dec. 11, 1967, now US. Pat. No. 3,574,234, which parent application relates to 4-hydroxy coumarin derivatives, which are represented by the general formula as in the copending application, and optionally substituted in the. 3-position by an aromatic or heterocyclic radical.

The new 4-hydroxy coumarins of the present improvement are represented by the formula R CED-CBZ-CH-lh in which R is a member of the group formed by hydrogen, the phenyl, halophenyl, dihalophenyl, nitrophenyl, methoxyphenyl tolyl, methylene, dioxyphenyl and furyl radicals;

R is a member of the group formed by the methyl, phenyl, halophenyl, nitrophenyl, diphenyl, halodiphenyl, nitrodiphenyl and naphthyl radicals;

R is hydrogen or a halogen.

In the preferred subgenus, R is H or C H R is C H C H or C 'H,C 'H X wherein X is Br or Cl; and R is H.

These new 4-hydroxy coumarins have very powerful oral anticoagulating actions of the antivitamin K type.

The hypoprothrombinemiant properties of the compounds of the invention make them of particular interest.

Furthermore, the 4-hydroxy coumarins of the present improvement are radcides of considerable interest, which cause in rodents, which have consumed food to which these new compounds are added, a high mortality due to internal hemorrhage.

The 4-hydroxy coumarins of Formula II can be obtained by reduction of compounds of formula o O (In) in which the substituents R, R and R have the same meanings as in Formula II.

The reduction of the intermediate ketone compounds is effected either by means of aluminium isopropylate or isopropanolic solution, or by a hydride of alkali metal and boron.

It has recently been found, as previously mentioned in the parent patent, that the reduction of the carbonyl group of the intermediate molecules into carbinol grouping increases, depending on the value of R and R in the general Formula II, and to a very considerable degree, the hypoprothrombinemiant activity of these compounds.

Certain intermediate ketone compounds which come within the scope of the general Formula 111, in which R, R and R have the same meanings as previously, are novel and because of this fact form part of the invention; these are more particularly the following 4-hydroxy coumarins:

(parabromophenyl-Z'-parabenzoyl)-3-ethyl-4-hydroxy coumarin, (parachlorophenyl-2-parabenzoyl)-3-ethyl-4-hydroxy coumarin, (paranitrophenyl-2-parabenzoyl)-3-ethyl-4-hydroxy coumarin, (2'-parabromobenzoyl)-3-ethyl-6 bromo-4-hydroxy coumarin, (2'-parachlorobenzoyl-3-ethyl-6-chl0ro-4-hydroxy coumarin, (2-benzoyl)-3-ethyl-6-bromo-4 hydroxy coumarin, 3- (4'-hydroxy-3'-coumarinyl)-3-pheny1 parachloropropiophenone, 3-(4'-hydroxy-3'-coumarinyl)-3-paranitrophenylpropiophenone, 3-(4'-hydr0xy-3'-coumarinyl)-3-parabromophenylpropiophenone, 3-(4-hydroxy- '-coumarinyl)-3p-phenyl-l-naphthylpropan-l-one,

' yl)-propan-1-one,

HNOCHz-CHz-CO-RrHCl in which R, has the same meaning as in the formula previously referred to.

When the new ketones contain an asymmetrical carbon, that is to say, when R is in Formula III represents a phenyl, halophenyl, nitrophenyl or furyl radical, these are obtained by 4-hydroxy coumarin being condensed with an a-ethylenic ketone of the general formula in which R has the same meaning as in Formula III.

Examples which illustrate the invention in a non-limiting manner are given below:

EXAMPLE 1 3-(4-hydroxy-3-coumarinyl)-1-phenyl-propan-1-ol 7.35 g. (0.025 mol) of 3-ethyl-(2-benzoyl)-4-hydroxy coumarin, M.P. 152 0., prepared by the method described in French Pat. No. 1,206,393 of Aug. 18, 1958, are placed in suspension in 150 ml. of anhydrous methanol. 2.85 g. (0.075 mol) of sodium hydrobromide are added in small fractions, while keeping the temperature below 20 C. On completing the addition, the mixture is left while stirring for 3 hours at ambient temperature, whereafter it is acidified with 3 ml. of acetic acid. The solution is evaporated to dryness and the residue is taken up in 200 ml. of a hot 5% solution of HNaCO This solution is acidified and the compound which is obtained is recrystallised twice from 50% aqueous ethanol. There I are obtained 4.3 g. (58.5%) of a white product melting at 114 C. (sealed tube-Gallenkamp apparatus).

Gravimetric analysis.-C H O (molecular weight =293.31): Calculated (percent): C, 72.96; H, 5.44. Found (percent): C, 73.11; H, 5.62.

I EXAMPLE 2 3-(4'-hydroxy- -coumarinyl)-l-parachlorophenylpropan- 1-01 Cm-Cm-pHQQ v on 7 \xo 0 I 4 v Gravimetric analysis. C H ClO (molecular weight=330.5): Calculated (percent): C, 65.36; H, 4.57. Found (percent): C, 65.56; H, 4.60.

EXAMPLE 3 3- (4-hydroxy- '-coum arinyl) -1-parabromophenylpropan-l-ol 3.7 g. (0.01 mol) of 3-ethyl-2-(parabromobenzoyl)-4- hydroxy coumarin (M.P.=230 C.) are reduced in anhydrous methanol with 1.1 g. (0.03 mol) of sodium hydrobromide. After the same operations as in Example 1, the product obtained is solubilised in a 5% HNaCO solution; the solution is acidified and the precipitate is recrystallised from 50% aqueous ethanol. There are obtained 2.8 g. of product, melting at- 159 C. (sealed tube).

Gravimetric analysisg. C H O Br (molecular weight=375.l2): Calculated (percent): C, 57.61; H, 4.03. Found (percent): C, 57.41; H, 4.15.

EXAMPLE 4 3 4'-hydroxy-3 '-coumarinyl) l-paranitrophenylpropan-l-ol 3.4 g. (0.01 mole) of 3 ethyl(2-paranitrobenzoyl)-4- hydroxy coumarin are reduced with 6.12 g. (0.03 mol) of aluminum isopropylate in 75 ml. of anhydrous isopropanol. After refluxing for one hour, the mixture is poured into iced water and acidified with 10 ml. of concentrated HCl. It is suction-filtered, washed with water and recrystallised from 50% ethanol. After filtration, it is 3.1-! lowed to crystallise. The product is solubilised in a 5% solution of HNaCO and then, after acidification, it is once again crystallised from 50% aqueous ethanol. Yield=2.3 g., i.e. 68 The product has a melting point of 178 C. (sealed tube).

Gravimetric analysis. C H NO (molecular weight=341.30): Calculated (percent): C, 63.34; H, 4.43. Found (percent): C, 63.47; H, 4.38.

EXAMPLE 5 3- (4'-hydroxy-3 '-coumarinyl) -1-paradiphenylylpropanl-ol on O EXAMPLE 6 3- (4-hydroxy- '-coumarinyl) 1- (4'-bromoparadiphenylyl)-propan-1-ol This product is prepared from the 3-ethyl-(parabromophenyl-Z-benzoyl)-4-hydroxy coumarin, which is a new compound obtained in the following manner: 6.15 g. (0.015 mol) of 3 piperidino-parabromophenyl propiophenone hydrochloride (Tohuku Yakka Diagaku Kiyo, 4, 68-78, 1957) are refluxed for 3 hours with 2.43 g. 0.015 mol) of 4-hydroxy coumarin in 50 ml. of pyridine. The solution is poured into iced water and acidified with HCl. The product is washed with boiling acetic acid and then with alcohol. It melts at 221 C. (sealed tube).

Yield=4.5 g.

Gravimetric analysis. C H BRQ, (molecular weight=449.30): Calculated (percent): 64.16; H, 3.80; Br, 17.79. Found (percent): C, 63.96; H, 3.88; Br, 17.61.

This compound is reduced in the following manner: 4.49 g. (0.01 mol) are suspended in 75 ml. of isopropanol. 6.12 g. (0.03 mol) of aluminium isopropylate are introduced and refluxing takes place for 1 hour. The compound is poured into iced water and acidified to pH 1 with HCl. The product which precipitates is suction-filtered and recrystallised twice from 50% aqueous alcohol. Yield=67% of 3 (4' hydroxy-3'-coumarinyl)-1-(4'-bromo paradiphenylyl)-propanol, melting at 202 C. (sealed tube).

Gravimetric analysis- C H BrO (molecular weight=451.3 1)

Calculated (percent): C, 63.87; H, 4.24; Br, 17.71. Found (percent): C, 63.83;H, 4.40; Br, 17.88.

EXAMPLE 7 3 (4'-hydroxy-3 '-coumarinyl)-1-(4'-chloro paradiphenylyl)propan- 1-01 This compound was prepared from the 3-ethyl-(parachlorophenyl-Z-benzoyl)-4-hydroxy coumarin, a new compound which itself was prepared in the following manner:

4.86 g. (0.03 mol) of 4-hydroxy coumarin,

10.92 g. (0.03 mol) of 3-piperidino-parachlorophenyl propiophenone hydrochloride (T ohuku Yakka Daigaku Diyo, 4, 69-78, 1957) and 60 ml. of pyridine are refluxed for 3 hours. The reddish limpid solution is poured into iced water and acidified with HCl. The product obtained is suction-filtered and recrystallised fiom CH OOOH. There are obtained 9.8 g. (81%) of a product melting at 212 C. (sealed tube).

Gravimetric analysis.-

C24H17C1O4 (molecular weight=404..83) Calculated (percent): C, 71.21; H, 4.23. Found (percent): C, 71.04; H, 4.37.

This compound, reduced as in Example 5 with aluminium isopropylate, melts at 165 C. (sealed tube) and is only slightly soluble in aqueous alkali medium.

Gravimetric analysis.

C H ClO (molecular weight=406.84)

Calculated (percent): C, 70.86; H, 4.71. Found (percent): C, 70.72; H, 4.89.

EXAMPLE 8 3- (4'-hydroxycoumarinyl) 1- (4'-nitroparadiphenylyD-propan- 1-01 C H NO (molecular weight=415 .38)

Calculated (percent): C, 69.40; H, 4.13. Found (percent): C, 69.38; H, 4.21.

This compound is reduced as in the preceding example aluminium isopropylate and recrystallised from 60% aqueous ethanol. It melts at 190 C. (sealed tube). Yield=59%.

Gravimetric analysis.

C H NO (molecular weight=417.39)

Calculated (percent): C, 69.07; H, 4.58.. Found (percent): C, 68.95; H, 4.63.

EXAMPLE 9 3- (6-bromo-4'-hydroxy-3 -coumarinyl)-1-parabromophenyl-propanl-ol OHFOHZ-EHQ-Br This compound was obtained by reducing the 3-ethyl- (parabromo-2-benzoyl)-6-bromo-4-hydroxy coumarin.

This new intermediary was prepared as in the preceding examples by condensing the 6-bromo-4-hydroxy coumarin with 3-piperidino parabromopropiophenone hydrochloride in pyridine. It is a white compound, of which the alkaline salts are sparingly soluble in water and melt at 236 C.

The reduction was carried out under the following conditions: 6.78 g. (0.015 mol) of the aboye compound are reduced with 9.18 g. (0.045 mol) of aluminium isopropylate in ml. of anhydrous isopropanol. After recrystallisation from 60% aqueous ethanol, there are obtained 5.5 g. (81%) of a compound crystallising as white needles, melting at 168 C.

Gravimetric analysis.-

C H Br O (molecular weight=454.13)

Calculated (percent): C, 47.60; H, 3.11. Found (percent): C, 47.76; H, 3.17.

EXAMPLE 10 3-(6'-chloro-4'-hydroxy-3'-coumarinyl)- 1-parachlorophenyl-propan-l-ol om-om-zn-Q-o.

This compound was obtained from the 3-ethyl-(2-parachlorobenzoyl)-6-chloro-4-hydroxy coumarin, a new compound melting at 226 C. and prepared by the action of 3-piperidinoparachloropropiophenone hydrochloride on 6-chloro-4-hydroxy coumarin in pyridine. 7.26 g. (0.02 mol) of this compound were reduced with 2.27 g. (0.06 mol) of sodium hydrobromide in 150 ml. of anhydrous methanol. Using the technique previously described, there are obtained 5.7 g. (78%) of a white compound which is well-crystallised (aqueous ethanol) and melts at 179 C. (sealed tube).

Gravimetric analysis.C H Cl O (molecular weight -=365.20): Calculated (percent): C, 59.19; H, 3.86. Found (percent): C, 59.31; H, 4.04.

EXAIMPIJE 11 3-(6-bromo-4'-hydroxy-3-coumarinyl)- l-phenyl-propan- 1-ol EXAMPLE 12 4- 4-hydroxy-3 -coumarinyl) -4-phenyl-butan-2-ol 4.62 g. (0.015 mol) of 4-(4'-hydroxy-3' coumarinyl)- 4-phenyl-butan-2-one (I. Am. Chem. Soc., 66 902-6, 1944) are refluxed for 1 hour with 9.18 g. (0.045 mol) of aluminium isopropylate in 120 ml. of anhydrous isopropanol. The mixture is poured into 600 ml. of iced water containing 20 ml. of 6 N-HCl. The oil which decants is taken up in a 10% HNaCO solution, filtered and the alkaline solution is acidified. The product precipitates in the form of a white powder.

A second treatment is carried out with bicarbonate in the cold. The product is suction-filtered and dried under vacuum at ambient temperature. It shows a pasty fusion at 94-96 C. (sealed tube). Yieldi=3.25 g.

Gravimetric analysis.C 'H O (molecular weight =310.33): Calculated (percent): C, 73.53; H, 5.85. Found (percent): C, 73.37; H, 5.80.

EXAMPLE 13 4-(4'-hydroxy-3'-cournarinyl)-4-parachlorophenyl-butan-Z-ol i As in Example 12, 10.27 g. (0.03 mol) of 4-(4-hydroxy- 3'-cournarinyl)-4-parachlorophenyl-butan*2-one (W. G.

Stoll, Proc. Interm. Conf. Thromb, Embol. 1954, 244-), are reduced with 18.36 g. (0.09 mol) of aluminium isopropylate.

The product which is obtained (6.35 g.yield 61.5%) shows a pasty fusion at -97" C. (sealed tube).

Gravimetric analysis.--C H C1O (molecular weight =344.78): Calculated (percent): C, 66.18; H, 4.97. Found (percent): C, 66.03; H, 5.04.

EXAMPLE 14 4- 4'-hydroxy-3 '-coumarinyl) -4-paramethoxy phenyl-butan-Z-ol (l) C Ha 6.76 g. (0.02 mol) of 4-(4'-hydr0xy-3'-coumarinyl)-4- paramethoxy phenoxy phenyl-butan-Z-one (J. Am. Chem. Soc., 66, 902-6, 1944) are treated with 12.24 g. (0.06 mol) of aluminium isopropylate inl20 cc. of isopropanol under the conditions previously described.

There are obtained 6.2 g. (91%) of a white compound which is soluble in the cold in a 5% bicarbonate solution which, after recrystallisation from a mixture of acetone and water, melts at 78 C. (sealed tube).

Gravz'metric analysis. C H O (molecular weight =340.36): Calculated (percent): C, 70.58; H, 5.92. Found (percent): C, 70.78; H, 6.11.

EXAMPLE 15 4-(4'-hydroxy-3'-coumarinyl)-4-(3',4-dichlorophenyl)- butan-2-ol OH O O 7.4 g. (0.02 mol) of 4-(4-hydroxy-3'-coumarinyl)-4- (3',4-dichlorophenyl)-butan-2-one (M'P=176 C.) reduced with 0.03 mol of isopropylate, lead with a yield of 93% to a white compound which has good solubility in a 5% HNaCO solution and melting at 92 C. (sealed tube-pasty fusion).

Gravz'metric analysis.--C H Cl O (molecular weight =379.23): Calculated (percent): C, 60.17; H, 4.25. Found (percent): C, 60.08; H, 4.30.

EXAMPLE 16 4-(4-hydroxy-3'-coumarinyl)-4-paratolyl-butan-2-ol 8.05 g. (0.025 mol) of 4-(4'-hydroxy-3'-coumarinyl)- 4-paratolyl-butan-2-one are reduced under the conditions of the preceding examples with 15.3 g. (0.075 mol) of aluminium isopropylate in ml. of isopropanol. After passing through a bicarbonate solution, acidification and recrystallisation from acetone and water, there are obtained 5.70 g. (70%) of a white compound melting at 119 C. (sealed tube).

xGravimetric analysis. C H O (molecular weight =324.36): Calculated (percent): C, 74.06; H, 6.21. Found (percent): C, 73.93; H, 6.39.

IEXAMPLE 17 4-(4'-hydroxy-3'-coumarinyl) -4-(3,4'-methy1ene dioxyphenyl)-butan-2-ol 7.04 g. (0.02 mol) of 4-(4'-hydroxy-3'-coumarinyl)-4- (3',4-methylene dioxyphenyl)-butan-2-one are reduced with 12.24 g. (0.06 mol) of aluminium isopropylate. The product obtained, with a yield of 87%, shows a pasty fusion at 96 C. in a sealed tube.

Gravimetric analysis. C H O (molecular weight =354.34): Calculated (percent): C, 67.79; H, 5.12. Found (percent): C, 67.64; H, 5.23.

EXAMPLE 18 4- (4-hydroxy-3'-coumarinyl)-4-(paranitrophenyl)- butan-Z-ol 7.06 g. (0.02 mol) of 4-(4'-hydroxy-3'-coumarinyl)-4- paranitrophenyl-butan-2-one are reduced with 12.24 g. (0.03 mol) of aluminium isopropylate. There are obtained 6. 6 g. of a white compound melting at 106 C. (acetone-water) in a sealed tube, corresponding to a yield of 93%.

Gravimetric analysis.C H -;'NO (molecular weight =355.33): Calculated (percent): C, 64.21; H, 4.82. Found (percent): C, 64.04; H, 4.96.

EXAMPLE 19 4-(4-hydroxy-3-coumarinyl)-4-(metanitrophenyl)- butan-Z-ol Starting with 7.06 g. (0.02 mole) of 4-(4'-hydroxy-3'- coumarinyl) 4 metanitrophenyl)-butan 2-one, reduced with 12.24 g. (0.03 mol) of aluminium isopropylate, there is obtained, with a yield of 91.50%, 6.4 g. of 4-(4'- hydroxy 3' coumarinyl) -4-(metanitrophenyl)-butanol, melting at 96 C. (sealed tube).

Gravimetric analysis.--C H N0 (molecular weight: 355.33): Calculated (percent): C, 64.21; H, 4.82. Found (percent): C, 64.08; H, 4.90.

10 EXAMPLE 2o 4- (4'-hydroxy-3 '-coumarinyl) -u-4-furyl-butan-2-ol EXAMPLE 21 3-(4'-hydroxy-3'-coumarinyl)-1,3-diphenylpropan-1-ol 18.5 g. (0.05 mol) of 3-(4'-hydroxy-3'-coumarinyl)-3- phenyl propiophenone and 30.6 g. (0.15 mol) of aluminium isopropylate are heated under reflux for 1 hour. The solution is poured into acidulated iced water and the product which precipitates is taken up in a hot 10% sodium bicarbonate solution. The alkaline solution is acidified. The product which precipitates, dried under vacuum, melts at C. (sealed tube).

As set out in the parent patent, these molecules have two asymmetrical carbon atoms and it can be assumed that the compounds obtained are a mixture of diastereo isomers. With certain compounds, when the end of the chain is aromatic, it has been possible by crystallisation to obtain one of the diastereo isomers having a melting point decidedly higher than the mixture. Analysis of the mixture, which melts at 85 C. and is obtained with a yield of 70%, is as follows:

Gravimetric analysis.C H O (molecular weight: 372.40): Calculated (percent): C, 77.40; H, 5.41. Found (percent): C, 77.53; H, 5.46.

After recrystallisation from a mixture of acetone and hexane or a mixture of methyl isobutyl ketone and hexane, a compound is obtained which melts at 132 C. (sealed tube), of which the gravimetric analysis is as follows:

C H 0 .-Calcu1ated (percent): C, 77.40; H, 5.41. Found (percent): C, 77.20; H, 5.42.

EXAMPLE 20 3-(4'-hydroxy- '-coumarinyl)-3-parachlorophenyl-1- phenyl-propan-l-ol 1 1 tion is poured into acidulated water and the product which precipitates is taken up in 600 ml. of hot 5% HNaCO The solution is filtered and acidified. There are obtained 12.2 g. (75%) of a white compound which melts at 95 C. (pasty fusion) (sealed tube).

Gravimetric analysis.-C H ClO (molecular weight =406.84): Calculated (percent): C, 70.85; H, 4.71. Found (percent): C, 70.66; H, 4.83.

After being recrystallised twice from a mixture of methyl isobutyl ketone and hexane, the diastereo isomer is obtained, which melts at 168 C. (sealed tube).

Gravimetric analysis.C H ClO (molecular weight: 406.84): Calculated (percent): C, 70.85; H, 4.71. Found (percent): C, 70.83; H, 4.69.

EXAMPLE 23 3- (4-hydroxy-3 '-coumarinyl) -1 ,3-di- (parachlorophenyl) propan-l-ol Under the foregoing conditions, 17.6 g. (0.04 mol) of 3-(4-hydroxy 3' coumarinyl) 3 parachlorophenylparachloropropiophenone, M.P.=162 C., are reduced with 24.5 g. (0.12 mol) of aluminium isopropylate. The desired product is obtained with a yield of 72%, melting at 105 C. after being passed twice through HNaCOg.

Gravimetric analysis.C I-I O Cl (molecular weight -=441.29): Calculated (percent): C, 65.32; H, 4.11; Cl, 16.07. Found (percent): C, 65.12; H, 4.30; CI, 15.87.

EXAMPLE 24 3 4'-hydroxy-3 '-coum arinyl -3 -phenyl1-parachlorophenyl-propan-l-ol This compound is obtained from the 3-(4-hyclroxy-3'- coumarinyl)-3-phenyl-parachloropropiophenone, which is a new compound obtained in the following manner: 17.8 g. (0.11 mol) of 4-hydroxy coumarin are condensed with 24.3 g. (0.1 mol) of benzylidene parachloroacetophenone in the presence of 80 mg. of hexamethylene imine in 160 ml. of water. The mixture is left under reflux for 5 hours, the organic phase is decanted; and crystallised in benzene. The product, C H ClO melts at 165 C. (sealed tube).

The ketone compound is reduced under the usual conditions: 16.2 g. (0.04 mol) and 24.5 g. (0.12 mol) of aluminium isopropylate in 300 ml. of isopropanol. After acidification of a solution iri sodium bicarbonate, there are obtained 12.7 g. (77%) of a white compound melting at 95 C. (sealed tube).

Gravimetric analysis.-C H ClO (molecular weight =406.84): Calculated (percent): C, 70.85; H, 4.71; Cl, 8.71. Found (percent): C, 71.02; H, 4.91; Cl, 8.52.

By crystallisation in a mixture of methyl isobutyl ketone and hexane, the diastereo isomer melting at 175 C. (sealed tube) is obtained:

Grdvimetric analysis. C H CIO (molecular weight =406.84): Calculated (percent): C, 70.85; H, 4.71; C], 8.71. Found (percent): C, 70.87; H, 4.92; Cl,

' 12 EXAMPLE 25 3-(4-hydroxy-4-coumarinyl)-3 paranitrophenyl-lphenyl-propan-l-ol the 3-(4-hydroxy-3'-coumarinyl)-3-paranitrophenyl propiophenone, itself obtained in the following manner:

paranitrobenzylidene acetophenone25.3 g. (0.1 mol) 4-hydroxycoumarin17.8 g. (0.11 mol) piperidine-0.89 g.

dioxane cc.

Heating under reflux takes place for 7 hours. The solvent is evaporated and the residue is crystallised in ace tone. Recrystallisation takes place in a mixture of alcohol and dioxane. There are obtained 26.2 g., i.e., 63%, of white crystals melting at 230 C. (sealed tube), C24H1'INO6- This compound is then reduced with aluminium isopropylate. By operating on 18.67 g. (0.045 mol) of the intermediate compound described above, there are obtained 13 g. of the corresponding alcohol (70%), having a melting point of C. (sealed tube).

Gravimetric analysis.-C H NO (molecular weight =417.40): Calculated (percent): C, 69.06; H, 4.59; N, 3.35. Found (percent): C, 68.97; H, 4.70; N, 3.38.

Two recrystallisations in the mixture of methyl isobutyl ketone and hexane supply an isomer melting at l61162 C. (sealed tube).

Gravimetric analysis.C H NO Calculated (percent): C, 69.06; H, 4.59; N, 3.35. Found (percent): C, 68.84; H, 4.53; N, 3.53.

EXAMPLE 26 3- (4'-hydroxy-3 '-coumarinyl) -3-parabromophenyl-1- phenyl-propan-l-ol The compound of this example is prepared from 3- (4'- hydroxy-3'-coumarinyl) 3 parabromophenyl propiophenone.

This intermediary is obtained in the following manner:

the following are heated for 7 hours under reflux:

This intermediatry is reduced with a yield of 73% as in the preceding example. The 3-(4'-hydroxy- '-coumarinyl)-3-parabromophenyl .1 phenyl-propan-l-ol has a pasty fusion at 95100 C. (sealed tube).

Gravz'metrzc analysis.C 4I-I BrO (molecular weight =451.31): Calculated (percent): C, 63.87; H, 4.24; Br, 17.71. Found (percent): C, 63.76; H, 4.36; Br, 17.59.

From the foregoing mixture, the diastereo isomer, melting at 154 C. (sealed tube), is extracted by crystallisation in a mixture of isobutyl ketone and hexane.

Gravimetric analysis.-C H BrO (molecular weight =451.34): Calculated (percent): C, 63.87; H, 4.24; Br, 17.71. Found (percent): C, 63.82; H, 4.42; Br, 17.77.

EXAMPLE 27 3-(4'-hydroxy- '-coumarinyl)-3-pheny1-1-fl-naphthylpropan-l-ol OH A CaHs (BH-JJHz-GH The compound of this example was obtained fiom the 3-(4'-hydroxy- -coumarinyl) 3B phenyl-l-naphthylpropan-l-one. 'Ihis intermediary is obtained by heating the following mixture for 7 hours under reflux:

benzylidene-B-acetonaphthone25.8 g. (0.1 mol) 4-hydroxy coumarin17.8 g. (0.11 mol) piperidine-0.9 g.

dioxane-100 cc.

There are obtained 26.3 g. of white crystals (ethanol) melting at 138 C. (sealed tube).

Gravimetric analysis.C H O (molecular wieght =420.44) Calculated (percent): C, 79.99; H, 4.79. Found (percent): C, 79.82; H, 4.95.

This intermediary, 14.7 g. (0.35 mol), is reduced with aluminium isopropylate with a yield of 9.6 g. (68%). A white compound is obtained which has a spread melting point at 100105 C. (sealed tube).

Gravimetric analysis.C H O (molecular weight =422.46): Calculated (percent) C, 79.60; H, 5.25. Found (percent): C, 79.50; H, 5.09.

EXAMPLE 28 3- (4-hydroxy3 -coumarinyl) -3-phenyl- 1- (4'- diphenyl) propan-l-ol The compound of this example is obtained from 3-(4- hydroxy- -coumarinyl) 3 phenyl-l-(4-diphenyl)-propan-l-one.

This intermediary is obtained by the following being heated for 8 hours under reflux:

benzylidene paraphenyl acetophenone23.7 g. (0.08 mol) 4-hydroxy coumarin14.3 g. (0.088 mol) piperidine0.7 g.

dioxane-80 ml.

There are obtained 18.2 g. (52%), melting at 172 C. (sealed tube), after two recrystallisations from ethyl acetate.

Percentage analysis.C H O (molecular weight 446.48): Calculated (percent): C, 80.70; H, 4.97. Found (percent): C, 80.65; H, 4.91.

This intermediary was reduced with a yield of 80%, using a mixture of isopropanol and dioxane (75-25).

After two passages in the sodium salt stage (hot bicarbonate), a white product is obtained which melts at 110 C. (sealed tube).

C H O (molecular weight=448.49): Calculated (percent): C, 80.34; H, 5.39. Found (percent): C, 80.35; H, 5.39.

An isomer melting at 194 C. is isolated in the mixture of methyl isobutyl ketone and hexane.

Gravimetric analysz'.s.--C H .,,O, (molecular weight =448.49): Calculated (percent): C, 80.34; H, 5.39. Found (percent): C, 80.18; H, 5.61.

EXAMPLE 2 9 3 (4'-hydroxy-3 -coumariny1)-3phenyl- 1- (4-chloro-4'- diphenylyl)propan-1-ol I 00H; gin ham.

was obtained from the 3-(4'-hydroxy- '-coumarinyl)-3- phenyl-1-(4-chloro 4' diphenylyl)propan-1-one, which compound is itself prepared in the following manner:

22.3 g. (0.07 mol) of benzylidene para-(4'-chlorophenyl)- acetophenone 12.5 g. (0.77 mol) of 4-hydroxy coumarin 0.70 g. piperidine 70 ml. dioxane are refluxed for 7 hours.

There are obtained 22.5 g. (67%) of a compound melting at 182 C. (sealed tube), after crystallisation in a mixture of alcohol and dioxane (C H ClO 16.8 g. (0.035 mol) of this compound are reduced with 21.4 g. of aluminium isopropylate in 260 ml. of isopropanol and 50 ml. of dioxane. After refluxing for 1 hour, the solution poured into 1000 ml. of cold water containing ml. of 21 B HCl allows the precipitation of a coloured product, which is purified by passage in solution into hot 5% HNaCO After acidification, the white product recipitates. After drying under vacuum, there are obtained 13.2 g. (78%) of a compound melting at 108 C. (sealed tube).

Gravimetric analysis.C H ClO (molecular weight: 482.93): Calculated (percent): C, 74.60; H, 4.80; CI, 7.35. Found (percent): C, 74.43; H, 4.82; CI, 7.22.

EXAMPLE 30 3- 4'-hydroxy-3 '-coumarinyl) -3-pheny1- 1- (4- br0mo-4'-diphenylyl)propan-l-ol (a) 3 (4'-hydroxy-3'-coumarinyl) 3 phenyl-1-(4- bromo 4' diphenylyDpropan-l-one.The following are heated for 7 hours under reflux:

18.2 g. (0.05 mol) of benzylidene para-(4'-bromophenyl) acetophenone 8.9 g. (0.055 mol) of 4-hydroxy coumarin 0.45 g. of piperidine 50 ml. of dioxane.

The solvent is evaporated under vacuum and the residue is recrystallised from a mixture of alcohol and dioxane. There are obtained 16.2 g. (62%) of a white compound melting at C. (sealed tube). C 'H BrO b) 13.1 g. (0.025 mol) of this compound are reduced with 15.3 g. (0.075 mol) of aluminium isopropylate in 200 ml. of isopropanol and 60 ml. of dioxane. The solution obtained is poured after refluxing for 1 hour into acidulated water. The precipitate which forms is dissolved in HNaCO and acidified. After drying, this product is analytically pure. There are obtained 9.2 g. (70%) of white compound melting at 112-115" C.) (sealed tube).

Gravimetric analysis.C H- BrO (molecular weight: 527.40): Calculated (percent): C. 68.32; H, 4.39; Br.

The active doses in man are between 2 and 100 tng. per day. The formula of a composition which can be orally administered to man is given below by way of example:

15.15. Found (percent): C, 68.12; H, 4.58; Br. 15 .29. 5 PHARMACOLOGICAL RESULTS Acme substance 4 Lactose 208 Table I gives the coefiicients of activity of the prod- Industrial starch 12 ucts on rabbits with respect to the comparison substance, Alginic acid 12 which is 3 ethyl (1' phenyl 2' acetyl) 4 hy- 1O Medicinal starch 12 droxy coumarin (warfarin). Magnesium stearate 2 TAB LE I I I I CH-CHz(|3H-R1 R O on Coetficients Example No. R: R R of activity Comparison 100 H CaHiBr (p) 25 H QED-N02 (p) 25 H CaH4Br 100 H -CaH --C1 (p) 100 CaH5- CH3 (100 -CaH4-0CH3 CH; 100

CaH3-C12 (D) (m) CH3 4, 000

Calla-(methylene dioxy 3-4) CH; 100

CaH4-NO2 (P) CH3 4O a Fur CH: 100

CuH4-C1 (p) 0611 100 --CoH4-Bl' 05115 (100 -06H, 2-naphthyl Each test was carried out on a batch of five rabbits, receiving the product to be tested. Concurrently, five rabbits received the comparison substance and one control Table II shows, in respect of a few compounds, the increase in activity (in the rabbit) between the ketone and alcoholic compounds.

The rat-destroying activity was investigated in connection with the adult White rat. The tests were carried out.

on batches often animals. They received for one day wheat containing the compound to be investigated, after having received for several days a feed consisting of ordinary wheat. The poisoned food was replaced from the second day by ordinary wheat.

1 7 When, in the general formula:

ner:

In a first period, the wheat was impregnated with an alcoholic solution of the toxic substance:

wheat- 1 kg. toxic compound25 mg. ethanol-50 cc.

The solvent is evaporated and the wheat is colored with a dye solution:

organol red dye-100 mg. valine oil-20 cc.

While the most active compounds also have a goon action in killing mice, it was seen that the compound for which, in the general formula:

has a much higher effect in killing mice than in killing rats.

The mouse-killing test of this product was carried out on male N.M.R.I. mice Weighing 25 g. The bait with 0.005% of mol. weight 568 was given for two days after one week of normal wheat, the food starting from the third day being once again normal wheat.

The mortality observed was 22/30 mice between the fourth and eighth days.

In the same concentration, the L.M. 568 (product given for one day under the conditions previously described for the rat-killing test) only produced two deaths out of ten.

What is claimed is:

1. A 4-hydroxy coumarin of the formula OH R i GH-CH -CH-li in which:

R is a member selected from the group consisting of hydrogen, phenyl, halophenyl, dihalophenyl, nitrov diphenylyl) propan-l-ol, in accordance with claim 1.

3. 3-(4'-hydroxy-3'-coumarinyl)-3-phenyl-1-(4-chloro- 4-diphenylyl) propan-l-ol, in accordance with claim 1.

4. 3-(4'-hydroxy-3'-coumarinyl)-3-phenyl- 1 (4' diphenyl)propan-1-ol, in accordance with claim 1.

5. 3-(4-hydroxy-3'-coumarinyl) 3 -phenyl 1 parachlorophenyl-propan-l-ol, in accordance with claim 1.

6. 3-(4'-hydroxy-3'-coumarinyl)- 1,3 -di (parachlorophenyl)propan-1-ol, in accordance with claim 1.

7. 4-(4-hydroxy-3-coumarinyl)-4-(3',4'-dichlorophenyl)butan-Z-ol, in accordance with claim 1.

8. 4- (4'-hydroxy-3'-coumarinyl) 4 parachlorophenyl butan-Z-ol, in accordance with claim 1.

9. 3'-(4-hydroxy-3-coumarinyl)-1-(4' chloroparadiphenylyl) propan-l-ol, in accordance with claim 1.

10. 3-(4-hydroxy-3'-coumarinyl)-1-(4' bromoparadiphenylylyl) propan-l-ol, in accordance with claim 1.

11. 3-(4-hydroxy-3'-coumarinyl)-l-paradiphenylyl-propan-l-ol, in accordance with claim 1.

12. Process for the preparation of a compound according to claim 1, consisting in the reduction of a compound of formula OH R in which R, R and R have the same meanings as above, by means of aluminum isopropylate in isopropanolic solution.

13. Process in accordance with claim 1, consisting in the reduction of a compound of formula I 2 CH-CH -CO-R in which R, R and R have the same meaning as above, by means of a hydride of alkali metal and of boron.

References Cited UNITED STATES PATENTS 2,427,578 9/1947 Stahmann et al. 260-3432 3,032,557 5/1962 Molho 260343.2 3,135,797 6/1964 Biel 260-3405 X JOHN M. FORD, Primary Examiner US. Cl. X.R. 

